A clay ball used for stopping the taphole in a cupola furnace.
Mersereau, 2
A long stick used for inserting the bott plug into the taphole to stop the
flow of metal. Mersereau, 2
a. One of a series of elongate, sausage-shaped segments occurring in
boudinage structure, either separate or joined by pinched connections, and
having barrel-shaped cross sections. AGI
b. A term applied loosely, without regard to shape or origin, to any
tectonic inclusion. Etymol: French, bag; blood sausage. AGI
A structure common in strongly deformed sedimentary and metamorphic rocks,
in which an original continuous competent layer or bed between less
competent layers has been stretched, thinned, and broken at regular
intervals into bodies resembling boudins or sausages, elongated parallel
to the fold axes. See also:pull-apart structure
A gravity anomaly calculated after corrections for latitude, elevation,
and terrain. Pron: boo-gay. See also:anomaly; Bouguer correction.
AGI
A correction made to gravity data for the attraction of the rock between
the station and the datum elevation (commonly sea level); or, if the
station is below the datum elevation, for the rock missing between station
and datum. The Bouguer correction is 0.01276 ph mgal/ft, or 0.04185 ph
mgal/m, where p is the specific gravity of the intervening rock and h is
the difference in elevation between station and datum.
See also:Bouguer anomaly
Gravity values after latitude, elevation, and Bouguer corrections have
been applied. Used in the gravitational method of geophysical prospecting.
Nelson
The correction made in a gravity survey to take account of the altitude of
the station and the rock between the station and sea level. AGI
A monoclinic mineral, Pb5 Sb4 S11 ; metallic;
bluish-gray; massive.
a. A detached rock mass larger than a cobble, having a diameter greater
than 10 in (25.4 cm) or 8 phi units, or about the size of a volleyball,
being somewhat rounded or otherwise distinctively shaped by abrasion in
the course of transport; the largest rock fragment recognized by
sedimentologists. In Great Britain, the limiting size of 8 in (20.3 cm)
has been used. AGI
b. See:boulder stone
c. A general term for any rock that is too heavy to be lifted readily by
hand. Also spelled bowlder. AGI
a. The breaking down of large stones at quarries by small explosive
charges. See also:secondary blasting
b. Secondary blasting of rocks too big to be moved conveniently in the
mine's transport system. Pryor, 3
An explosive used to break rock fragments by blockholing or mudcapping
methods. Long
a. The stiff, hard, and usually unstratified clay of the drift or glacial
period that contains boulders scattered through it. Also called till;
hardpan; drift clay; drift. See also:till; moraine. Fay
b. Glacial drift that has not been subjected to the sorting action of
water and therefore contains mixed particles ranging from boulders to clay
sizes. ASCE
A level tract covered with boulders. AGI
An unconsolidated deposit consisting mainly of boulders. AGI
A surface quarry worked only in detached masses of rock overlying the
solid rock; sometimes contracted to motion. Standard, 2
A quarry in which the joints are numerous and irregular, so that the stone
has been broken naturally into comparatively small blocks. A local term
applied to certain marble quarries in the region of Knoxville, TN, where
erosion has formed many large cavities and cracks, between which the rock
stands up as pinnacles. The cavities are now filled with clay. Fay
An obsolete term for any large rock mass lying on the surface of the
ground or embedded in the soil, differing from the country rock of the
region, such as an erratic. Syn:boulder
A fused mass of synthetic material up to 5 cm long, pear or carrot-shaped,
particularly as produced by the Verneuil or Crochralshi processes in the
production of synthetic sapphire, ruby, spinel, or rutile. Etymol: Fr.
"ball." Syn:birne
A small ovoid; an egg-shaped briquette. BS, 5
a. A sudden spalling off of the sides of ribs and pillars due to excessive
pressure; a bump. Zern
b. The rapid up-and-down reciprocating motion induced in a drill string by
rod vibration, drill string wrap-up, excessive volume or pressure of
circulation media, or the running of a bit on and over small, loose
materials on the bottom of a drill hole. Long